The scientist credited with discovering that electric currents produce magnetic fields was
A. Tesla.
B. Coulomb.
C. Faraday.
D. Oersted.
E. Ampere.
Answer: D
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A. 20 V B. 40 V C. 60 V D. 80 V E. 100 V
Jane's flashy boy friend has just given her a ring with a huge "diamond". Jane, who has studied physics, measures the polarizing angle for the stone and finds that the polarizing angle is 62.97°. The stone is
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(a) What is the frequency of an EM wave that has a wavelength of 1 millimeter? (b) What type of EM wave is this?